I posted yesterday about how blog tours can be a good solution for an introverted writer. But there are other options as well. Check out these great tips from BuildBookBuzz.com
How do you overcome your reluctance to promote your book, regardless of your reason? Here are the “I can’t do this” excuses that I hear most often and how to get around them:
via The shy author’s guide to book promotion | Build Book Buzz.
My Publishing Journey 
Thanks for linking to my site, Debbie. That post seems to be resonating — there are a lot of shy authors out there!
There are. In fact, it’s an epidemic. It’s the curse of the introvert.